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Fixing FPE in track finding for ITk

Noemi Calace requested to merge ncalace/athena:fix-fpe-itksispacepointsproseed into master

Fixing DIVBYZEROs in ITkSiSpTrackFinder. Recently noticed in test_run4_mu100_reco.

04:47:39 PerfMonMTSvc                                         INFO Event [ 4670] CPU Time: 00h02m17s, Wall Time: 00h02m41s, Vmem: 2.38 GB, Rss: 1.64 GB, Pss: 1.63 GB, Swap: 0.00 KB
04:48:09 PerfMonMTSvc                                         INFO Event [ 6515] CPU Time: 00h02m46s, Wall Time: 00h03m11s, Vmem: 2.38 GB, Rss: 1.64 GB, Pss: 1.63 GB, Swap: 0.00 KB
04:48:23 FPEAuditor                                        WARNING FPE DIVBYZERO in [Execute] of [ITkSiSpTrackFinder] on event 7357 0 0
04:48:39 PerfMonMTSvc                                         INFO Event [ 8303] CPU Time: 00h03m15s, Wall Time: 00h03m41s, Vmem: 2.38 GB, Rss: 1.64 GB, Pss: 1.64 GB, Swap: 0.00 KB

Performance is unchanged.

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